/**
 * Copyright (C) 2010, 2011 Neofonie GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package eu.dicode.analysis.demonstrator.model;

import com.google.common.base.Preconditions;

import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

/**
 * Holds a list of topics including their respective queries as configured by the user for
 * further change via the frontend.
 * */
public class TopicsCommand {

  /** List of topics. */
  private final List<TopicCommand> topics = new LinkedList<TopicCommand>();
  
  public TopicsCommand(final Collection<TopicCommand> topics) {
    Preconditions.checkNotNull(topics);

    this.topics.addAll(topics);
  }

  /** Returns an unmodifiable list of available topics. */
  public List<TopicCommand> getTopics() {
    return Collections.unmodifiableList(this.topics);
  }
}
